(1) the discriminative power of perceived overall health compared to domain-specific measures of health was moderate to large only at the fair/poor end of the perceived overall health spectrum ; (2) a single-item measure of perceived overall health did not cover domain-specific measurements of health since only 41.8% of the variance in perceived overall health was explained by all domain-specific measures ; and (3) the affective domains of functioning (psychological distress, mental health) were weakly related to perceived overall health.